- Introduction and Installation
- Grid System
- Buttons, Glyphicons, Tables
- Vertical Forms, Horizontal Forms, Inline Forms
- Progress Bar and Jumbotron
Dropdown Menu Using Bootstrap:
In bootstrap, dropdowns are created using the class="dropdown". What we will do is create a button and then convert the button into a dropdown.
As already stated in the last few tutorials, buttons can be created using the <button> tag. But in this button, we want to create a dropdown, so we will add the class="btn dropdown-toggle" and data-toggle="dropdown".
Basically, it would look something like this.
<button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown"> My Dropdown </button>
Note: data- toggle attribute has been replaced with data-bs-toggle in Bootstrap. So, to run the below code with Bootstrap 5 makes sure to replace data-toggle with data-bs-toggle.
Now we want to convert this button into a dropdown. So, we'll create an unordered list using the <ul> tag having class="dropdown-menu" and add items using the <li> tag.
Example:
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport"
content="width=device-width, initial-scale=1">
<link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">
<script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js">
</script>
<script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js">
</script>
</head>
<body>
<div class="container" style="color:green">
<h1>GeeksforGeeks</h1>
</div>
<div class="container">
<h4>Dropdown in Bootstrap</h4>
</div>
<div class="container">
<div class="row">
<div class="col-md-3">
<div class="dropdown">
<button class="btn btn-success dropdown-toggle"
type="button" data-toggle="dropdown">
GeeksforGeeks
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li><a href="#">HTML</a></li>
<li><a href="#">CSS</a></li>
<li><a href="#">JavaScript</a></li>
<li><a href="#">SQL</a></li>
</ul>
</div>
</div>
</div>
</div>
</body>
</html>
Output:
You can make your dropdown better by using classes in the <li> tag. To add a header in a dropdown add class="dropdown-header", to add a divider between items, use class="divider" and to disable an item in the list, use class="disabled".
Example:
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport"
content="width=device-width, initial-scale=1">
<link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">
<script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js">
</script>
<script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js">
</script>
</head>
<body>
<div class="container" style="color:green">
<h1>GeeksforGeeks</h1>
</div>
<div class="container">
<h4>Dropdown in Bootstrap</h4>
</div>
<div class="container">
<div class="row">
<div class="col-md-3">
<div class="dropdown">
<button class="btn btn-success dropdown-toggle"
type="button" data-toggle="dropdown">
GeeksforGeeks
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li class="dropdown-header container">
<b>HTML</b>
</li>
<li><a href="#">CSS</a></li>
<li><a href="#">JS</a></li>
<li class="divider"></li>
<li class="dropdown-header container">
<b>Language</b>
</li>
<li><a href="#"></a></li>
<li><a href="#">Python</a></li>
<li><a href="#">SQL</a></li>
</ul>
</div>
</div>
</div>
</div>
</body>
</html>
Output:
Navigation Tabs using Bootstrap:
To create a tabbed navigation menu, we need to make an unordered list using the <ul> tag and add class="nav nav-tabs". Now we can add our tabs using the <li> tag. Remember to assign one tab with class="active" to view it as the default active tab. Now, we need to write the content of each tab using the class="tab-pane" within the class=" tab-content". Note that you must assign ids to the respective tab-pane.
Adding the class="fade" adds a fading effect when the tabs are switched.
Example:
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport"
content="width=device-width, initial-scale=1">
<link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">
<script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js">
</script>
<script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js">
</script>
</head>
<body>
<div class="container" style="color:green">
<h1>GeeksforGeeks</h1>
</div>
<div class="container">
<h4>Navigation Tabs in Bootstrap</h4>
</div>
<div class="container">
<nav class="navbar navbar-default">
<div class="container-fluid">
<div class="navbar-header">
<a class="navbar-brand" href="#">
Nav bar
</a>
</div>
<ul class="nav navbar-nav">
<li class="active">
<a href="#">Home</a>
</li>
<li><a href="#">Practice</a></li>
<li><a href="#">Interviews</a></li>
<li><a href="#">Contribute</a></li>
</ul>
</div>
</nav>
</div>
</body>
</html>
Output: 
You can change the look and feel of the tabs by changing the class="navbar-nav" to "nav-pills" or "nav-stacked" and if you want your tabs to cover the whole screen then, try adding the class="nav-justified"
Similar to Dropdowns, we can disable any tab using class="disabled".
Output:
Note: Be careful during the use of nav-bar it will change its size depending on the screen size.